Sega has recently taken a few attempts at developing games for the Wii that were targeted at adults rather than kids. House of the Dead: Overkill and Madworld haven't been incredibly popular, but they've done well enough to turn a profit. In Sega's eyes, this makes mature-themed games for the Wii a successful experiment, or at least one they're willing to continue. Other companies are looking to get into the act as well. EA will be releasing M-rated Dead Space: Extraction for the Wii, and Bethesda has a project in the works too.